Flare-associated magnetic changes in an active region

Details Flare-associated magnetic changes in an active region Flare-associated magnetic changes in an active region

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..140...67j&link_type=abstract

Solar Physics, Volume 140, Issue 1, pp.67-84

Physics

11

Scientific paper

We report an instance of localized chromospheric polarity reversal in a rapidly-formed sunspot which appears to be part of new emerging flux. The chromospheric polarity reversal is preceded by extraordinarily fast growth of the transverse magnetic field and an increase in the line-of-sight magnetic flux of the newly formed sunspot in the photosphere. The strength of this reversal is more than 350 G at maximum, in contrast to approximately - 1300 G for the line-of-sight field and 400 G for the transverse field in the photosphere. Continued flare activity takes place around the site of the reversal with progressively increasing flare size and extent. It is suggested that a kinked or knotted flux loop, or a self-closed flux system developed above the fast-forming sunspot. So far, this phenomenon has been revealed in several active regions.

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